Recently, the National Bureau of Statistics released the latest data. In November 2015, the China Manufacturing Purchasing Managers Index (PMI) was 49.6%, which was 0.2% lower than the previous month. However, the PMI in high-tech manufacturing and equipment manufacturing has maintained a growth status. Although the great environment has developed well, the development of small and medium-sized enterprises in instrumentation is still difficult.

According to industry insiders' analysis, the main reasons for the decline in the manufacturing PMI are: First, due to weak domestic and international market demand and production off-season; Second, the recent commodity prices continue to fluctuate at low levels; Third, in the face of downward pressure on the economy, corporate procurement Activities have slowed down, and there is not enough willingness to restock.

According to the data, even if the manufacturing PMI fell, the PMI of high-tech manufacturing and equipment manufacturing in November was 53.1% and 51.6%, respectively, as the adjustment of China's manufacturing structure continued to advance, and continued to maintain growth. China's instrumentation industry is a high-tech manufacturing industry, but it has also maintained a rising state. In the environment where the development of the manufacturing industry is not optimistic, why instrumentation can maintain a growth trend. Among them can not be separated from the company's business strategy, in the first three quarters of 2015, instrumentation companies under the conditions of favorable policies, continue to adjust the direction of development and open up a broader market. Among them, Weltech bought international trade assets and diversified its operations. Weltech holds a 55% stake in Zijiang Guomao, and at the same time makes full use of the advantages of Zijiang International Trade's overseas channels, explores overseas markets, and forms the development mode of dual-owners of instrument and meter manufacturing and international trade, contributing to the development of the instrumentation industry. .

When the manufacturing industry is on the rise, the company's contribution is the highest. However, it also violated the principle. In the scale of the company, the PMI of SMEs was 48.3% and 44.8%, respectively, down 0.4 and 1.8 percentage points from the previous month. The development of enterprises is in a contraction range, especially in small and medium-sized manufacturing industries. The difficulties and problems in its production and operation are still outstanding. For example, companies in the instrumentation industry show the problems. It is understood that Nanjing Yueng Instrument Co., Ltd. has a great vision in the market layout, but encountered changes in the interests of the acquisition, resulting in the Nanjing Yuneng Instrument Co., Ltd. on the road to development difficulties, the emergence of employees to discuss wages.

The bottleneck in the development of production for small and medium-sized enterprises in instrumentation and metering has always been a common state of the market. This is a commonplace topic. But why have you always been in such a situation? One of the main reasons for this is the financial problem. There are no large-scale enterprises in the instrument and meter industries with sufficient funds and difficulties in financing. This makes the enterprises difficult to achieve in the transition and development. Moreover, the times of development of the times are changing, and when the SMEs have not yet fully realized the previous project, new development methods have emerged in the market. Moreover, SMEs are in a state of being in the status quo and there is no fierce competition in large companies, which has prompted SMEs in instrumentation to stand still. Even if the current policy is introduced, most of them focus on the transformation and development of small and medium-sized enterprises, but the historical problems left behind by instrumentation and small and medium-sized enterprises have not been completely resolved. Under the conditions of market development, capital, and its own conditions, small and medium-sized enterprises in instrumentation and instrumentation are faced with difficulties in transitional development. However, small and medium-sized enterprises in instrumentation have to overcome difficulties and break through the siege city before they can develop in the spring.

The great development of the industry is not only caused by some factors, but also formed by the efforts of various parties. In the face of the difficult development of small and medium-sized enterprises, large enterprises need to give them the first, pull them, and walk together on the way forward to make efforts for the development of the industry.

Welding elbow is shrimp "turn", it can be in the pipe or plate cutting after welding and become, and its specifications can be large. The number of nodes and the bending radius are determined by the producer. Welding bending is not very smooth, both of the bending radius is not large, generally about 1 times the diameter of the pipe.

Photo of Welded Bend:

Classification of welding elbow, according to its radius of curvature,

45 degree elbow

Can be divided into long radius elbow and short radius elbow. Long radius elbow refers to its radius of curvature is equal to 1.5 times the diameter of the tube, that is, R=1.5D. short radius elbow refers to its radius of curvature is equal to the outer diameter of the pipe, that is, R=D. D in the formula is the elbow diameter, and R is the radius of curvature. The most commonly used for 1.5D elbow, if not specified in the contract is 1D or 1.5D, then it is to optimize the use of 1.5D. GB/T12459-2005, GB/13401-2005, GB/T10752-1995., is the most commonly used executive standard in China.

Pressure grade classification

If according to the pressure level, there are about seventeen, and the United States pipe standards are the same, there are: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS,; Sch

180 degree welding elbow

80, Sch100, Sch120, Sch140, Sch160, XXS, which is the most commonly used STD and XS two. According to the angle of the elbow, 45 degree elbow, 90 degree elbow and 180. Species as a result of the elbow is a lot, when ordering, order is often taken as described in the following methods: such as "LR STD 90 8", said long radius, pressure rating for STD, 90o 8 "elbow; and as," 45 DEG SR XS 4 "said short radius, pressure rating for the XS and 45 degrees of 4" elbow. The above is about the classification of the elbow. Three links, there are two kinds of general. The diameter of the three equal diameter is equal to the diameter of three links, and both ends are the same diameter, but the diameter of the junction is different from that of the other two diameters. The method is as follows: for the equal diameter three links, such as the "T3" three general, the outer diameter is 3 inches and three inch diameter. For different diameter three links, such as the "T4 x 3.5 x three" means that the same diameter of four inch diameter of 3.5 inches of 4 inch diameter. The pressure level is the same as that of the elbow, and the range is the same.

This is the big head, method. Head size of said method is big diameter multiplied by the head diameter, for example "8 x 6" said big head with a diameter of 8 inches and head diameter is 6 inch head size.

Material division of welding elbow

Carbon steel: A234 WPB ASTM/ASME, WPC

Alloy: A234 WP 1-WP 12-WP ASTM/ASME 11-WP 22-WP 5-WP 91-WP911 15Mo3, 15CrMoV, 35CrMoV

Stainless steel: A403 WP 304-304L-304H-304LN-304N ASTM/ASME

A403 WP 316-316L-316H-316LN-316N-316Ti ASTM/ASME

A403 WP 321-321H ASTM/ASME A403 WP 347-347H ASTM/ASME

Low temperature steel: A402 WPL3-WPL ASTM/ASME 6

High performance steel: A860 WPHY 42-46-52-60-65-70 ASTM/ASME

structure

Welding elbow appearance

As the appearance of the welding elbow, then we say that the appearance of the welding elbow bar. Welding elbow appearance are fixed, of course, the general welding elbow appearance is according to different steel tube and to choose the different knowledge of welding elbow, so, in order to ensure the welding elbow appearance, usually Steel Pipe in the future, if not been yard rain washing off, then welding elbow after high temperature push general weld appearance of the elbow is appear out of the blue, of course, if the rain washed, we in high temperature after heating, heating welding elbow surface color are red. But overall, we guarantee tube is washed by the rain is very difficult, because is yard in summer is rain fog water washed, then push the system out of the welded elbow surface is red, too.

Technical requirement

Geometric dimensions include outside diameter, inside diameter and wall thickness. Also requires control

Radius of curvature. For example, the radius length is 1.5D, and the radius of curvature must be within the range of tolerances required. Due to these fittings, most used for welding, in order to improve the welding quality, end vehicles into the groove, leave a certain angle, side band, this requirement is quite strict, edge thick, at an angle of number and range of deviation provisions, geometric size than pipe much many. The surface quality and mechanical properties are basically the same as that of the tube. In order to facilitate welding steel, and the connecting pipe are the same. Fourth, is all the pipe fittings should be through the surface treatment, the inner and outer surface of the oxide scale through shot blasting, and then coated with anticorrosive paint. This is not only for export needs, in addition, in the country is to facilitate the transport to prevent rust oxidation, to do this work. Fifth is the packaging requirements, for small pipes, such as export, you need to do wooden, about 1 cubic meter, this provision in the case the number of elbows about not more than a ton, the standard allows the suit, large sets of small, but the total weight usually do not more than 1 ton. For large to a single package, like 24 "must be a single package. The other is labeled packaging, labeling is to indicate size, number, batch number, manufacturer trademark. In the pipe to be stamped on stamp, and attached to the packing list and the quality book file.

Welded Bend

Welded Bend Without Flanges,Welded Bend Pipe,Seamless Welded Bend,Welded Bend With Flanges

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